import * as Config from 'config'

export enum Kind {
  Form,
  Timer,
}

export interface Route {
  kind: Kind,
  config: Config.Config
}

export function from(location: Location): Route {
  const hash = location.hash.slice(1)
  const parts = hash.split('?')
  const path = parts[0]
  const search = parts.length > 1 ? parts[1] : ''

  const kind = path.startsWith('/timer') ? Kind.Timer : Kind.Form
  let config = Config.init()
  if (search.length > 0) {
    search.split('&').forEach(entry => {
      const xs = entry.split('=')
      if (xs.length === 2) {
        const key = xs[0]
        const value = parseInt(xs[1])
        if (key == 'prepare') config.prepare = value
        else if (key == 'tabatas') config.tabatas = value
        else if (key == 'cycles') config.cycles = value
        else if (key == 'work') config.work = value
        else if (key == 'rest') config.rest = value
      }
    })
    const params = search.split('&')
  }

  return { kind, config }
}

export function toString(route: Route): string {
  const path = route.kind === Kind.Form ? '/' : '/timer'
  let query = ''
  if (route.config !== undefined) {
    const { prepare, tabatas, cycles, work, rest } = route.config
    const params = [
      `prepare=${prepare}`,
      `tabatas=${tabatas}`,
      `cycles=${cycles}`,
      `work=${work}`,
      `rest=${rest}`,
    ].join('&')
    query = `?${params}`
  }
  return `#${path}${query}`
}